Hill says the girl’s mother was cleaning when she sent her 7-year-old son to find her. The boy found his sister in distress and got his mother, who found the girl on a treadmill with her neck on a cable attached to the exercise machine.

The girl’s mother called 911 and began trying to revive her. Officers and fire officials performed CPR on the girl while taking her to the hospital.

She is in what Hill says is “extremely critical condition” and on life support.

Hill says Tyson was out of town but returned to Phoenix immediately after learning of the accident.